Bolt-trimming machine



y 7, 152 T. H. BAUCK 1,711,630

BOLT TRIMMTNG MACHINE Filed Oct. 25, 1927 3 Sheets-Sheet 1 May 7, 1929.

T. H. BAUCK 1,711,630

BOLT TRIMMING MACHINE 3 Sheets-Sheet 2 Filed Oct. 25, 1927 T. H. BAUCK May 7, 1929.

'BOLT TRIMMING MACHINE Filed Oct. 25, 192.7 s Sheets-Sheet s Patented May 7, 1929.

IT D T TES CONNECTICUT;

PATENT. OFFICE.-

'THEODOREH. BAUCK, OF WATERBURY, ONNECTICUT, nssreNon TO THE E. J. AN-

VILLE MACHINE COMPANY, or WATERBURY, ON ECTICUT, CORPORATION or ,BO'LTFTR'IMMING MACHINE.

hpplieationfiled October 25. 1927. Serial N0. 22 8,552. V

This invention relates to a machine for trimming the heads of bolt and cap-screw blanks. y y I The object of the invention is to provide a blank trimming machine of the general type of those illustrated and described in patent to CampbelluNo. 959,455,, May 31, 1910, and reissuepatent to Riley No. 16,522, January 4, 1927, which will. be more rapid and surer in action, and which will more perfectly trim the heads 'thanethe prior machines. a, 1 y i e 'Inmachines of'this nature the blank is fed into line with a; trimming die fixed in theframe and a tubularpunch which is carried by a gate that is reciprocatedin the frame toward and from the die, the shank of the blank entering the punch andthe: punch forcing the head of theblankinto the die. In .the present invention the gate which holds the punch and which is forced ,forward by .a cam carries two independently movable slides, a rear slide that is forced forwardly a cam and aforward slide that holds a pin which extends through-the punch and that is forcedforwardly positively for a portion of its travelby therearslide and then is thrown forward stillfurthor by a .leverand spring. When the; gate is forced 3o forward by its camthe-pin pushes thehead of the blank against the trimmin ie andas a the gate continues its forward movement the shank of theblank enters the punch, the

pin retreating until the forward end of thepunch engages the under sideof the head of the blank and forces the blank head into the trimming die, the punch not entering-the die. Following this the rear slide by its cam is forced into engagement with the front slide and moves it forward until the pin pushes the blank head completely through. the trimming dieyat wh ch time the 'friction' of the. head of the blank inthe die is so relieved that the pin will bequic'kly drive the shank of the blank completely through thetrimming die. a f

The frame, blank. feeding means and driv- 1 the s11de,rear' or kickerislide and the means for die. and feed fingers with a actuating theseparts, and also the trimming blank indicated as fed between the punch anddie. n

Fig. 2 is a similar View showing the parts with the punch forward and the headof the blank forcedint'o the trimming die.

Fig. 3 shows a1 horizontal section elf-the gate and the parts carried thereby.

F g, 4 1s asection showing the positions of the parts w th the pin thrown, forward as trimming die.

after a blankihas" been knocked out of the In the drawingsl indicates the gatewhich is supported and reciprocated in the frame 2 as 1s common in headers and trimmers v V V v lhe gate at its rear end has two rolls 3 the gate forward at the 5 of the machine; Movablein therear end of, a centralopenmgin the gate; is therea'r has a roll 7 that is engaged byacam 8 fastenedon the-mam shaftbetweenthe gate cams 4. At the front end this' vslide has a cross head 9 with two forwardly extending rods 10 on whlch ar'esprmgs 11 tensioned to,

I through the crosshead, force the kicker slide backward and hold the roll 7-in engagement ;which are adapted to'be engaged for forcing proper timeby a 'Dair'of cams 4 fastened on the main shaft 7 or kicker, slide Atthe back mantis Slid with the kicker earn 8. In thecentral openingiin the gate in front of and aligned with the kicker shde .1s the forward, or knock out, slide 12 and extending forwardly from. this slide through a bi'ishing 1-3 and vintothe punch 1ft is the 'knock outpin 15; In a ;:II101tl$6 16 in thef knock out slide 12; is a. 45 thrown forward-by thele'ver and spring and block} '17. that hastrunniens18 won the ends the frame and its upper end extends through openings 22 (Fig. 3) in the gate, while its lower end is connected with a rod 23 on which is a spring 24 that is tensioned so as to normally thrust the lower end of the lever rearward and the upper end of the lever forward. The block 17 is fastened to the knock out slide 12 by a shearv pin 25 which is sufiiciently'strong to sustain all of the strains of normal operation but which will break and release the connection between the lever and the knock out slide should a blank become wedged in the die or should any other obstruction interfere with the forward movement of the knock out slide and pin.

vi ith the machine tooled as above described the blank 26' is fed, for example, by a parallelogram feed movement 27 of the character shown in the Campbell patent before mentioned, into line with the trimming die .28 and the punch li, as illustrated in Fig. 1. In operation the cams l advance the gate and the pin 15 presses the blank head against the face of the trimming die.

As the forward movement of the gate and punch continues the shank of the blank presses back the pin and enters the punch, the spring 24 and lever 20 yielding to permit this. When the punch engages the head. of

the blank it forces the head into'the trimming die until the'end'of the punch reaches the face of the die, as illustrated in Fig. 2. At this time the forward movement of the gate ends and the cam 8 then forces the kicker slide 6 into engagement with the knockout slide 12- and pressing it forward causes the pin to drive the blank until its head is forced through the die and the trimming completed When the trimming is completed the friction between the blank head and die is relieved allowing the spring 2st through the lever 20 to throw the knock outslide and pin forward quickly to the position illustrated in Fig. 4, and drive the shank of the blank completely through the trimming die. The gate then returns and the cycle of movementsrepeated. As the gate moves back a stop 29 engages the forward end of the knock out slide 12 and pushes it back with the gate. The engagement of studs 30 and 51 on the lever 20 with the stops 32 and 33 on the frame limits the movement-s of thelever 20.

lVit-h the mechanisms described the punch causes the major part of the trimming of the head of the blank but as it does not enter the die it does not complete the trimming. The kicker cam and slides, which are aligned with the pin. and. blank, cause the pin to positively drive the blank head through the die and complete the trimming. As ithe punch backs up themetal under the head of the blank while the kicker cam is operating and the pin is completing the trimming, the metal at the. rear edges of thehead 1s not torn off butis cleanly cut. The kicker cam being centrally located in the gate and in line with the pin and blank, the strains are such that a powerful 'action may be obtained for finishing the trimming with a relatively small pin. Should a blank become wedged the shear pin immediately breaks and releases the knock out slide so that the pin will not become damaged. The invention claimed is:

, 1,.In combination in a blank trimming machine, a fixed trimming die, a reciprocating gate, cams for forcing the gate toward the die, a tubular punch carried by the gate, a slide carried by and movable independently in a centralopening in the gate, a pin actuated by the slide and movable through the punch, a cam located between the gate operating cams for forcing said slide toward the die independently of the gate, and spring means adapted to move said slide forward independently of the gate, further than the throw of sa1d slide operating cam.

2. In combination in a blank trimming machine, afixed trimming die, a reciprocating gate, means for forcing the gate toward the die, a tubular punch carried by the gate,

a slide carried by and movable independently in a central opening in the gate, a pin actuated by the slide and movable through the punch,a cam located in line with the axis of the gate for forcing said slide to-- ward the die independently of the gate, and springme'ans adapted to move said slide forward independently of the gate, further than the throwof said slide operating cam.

8.1n combination in a blank trimming machine, a fixed trimming die, a reciprocating gate, cams for forcing the ate toward the die, 'atubular punch carried by the gate, a kicker slide and a knock out slide carried by and movable independently in a central opening. in the gate, a pin actuated bythe knock out slide and movable through the punch, a cam locatedbetween the gate operating cams for forcing the slides towards the die independently of the gate, and spring operated means adapted to move said knock out slide independently of the kicker slide and the gate.

a. In combination in a blank trimming machine, a fixed trimming die, a reciprocating gate, means for forcing the gate toward the die, a tubular punch carried by the gate, a plurality of aligned slides carried by and movable independently in a central opening in the gate, a pin held by the forward of said slides and movablethrough the punch, a cam locatedin alignment with said slides for forcingthe shdes towards the die indepe'ndentlv of the gate, and spring operated means adapted to move the front slide independently of the black slide and the gate.

5. In combination in a blank trimming machine, a fixed trimm ng die, a reciprocat- Cir ing gate, means for forcing the gate toward the die, a tubular punch carried by the gate, a plurality of aligned slides carried by and movable independently in a central opening in the gate, a pin held by the forward of said slides and movable through the punch, a cam located in line With said slides 01 forcing the slides toward the die inde pendently of the gate, a lever and spring for moving the front slide toward the die independently of the back slide and the gate, and

breakable means connecting said lever with said front slide. s

' THEODORE H. BAUCK. 

